package com.example.kt_base.s1

//TODO 20.Kotlin语言的Nothing类型特点
fun main() {
    show(-1)
}

private fun show(number: Int) {
    when (number) {
        -1 -> TODO("没有这种分数")
        in 0..59 -> println("不及格")
        in 60..70 -> println("分数及格")
        in 71..100 -> println("分数优秀")
    }
}